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Edit File : gntdev.h \| Size : 7.15 KB
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) / /***************************************************************************** * gntdev.h * * Interface to /dev/xen/gntdev. * * Copyright (c) 2007, D G Murray * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. / #ifndef __LINUX_PUBLIC_GNTDEV_H__ #define __LINUX_PUBLIC_GNTDEV_H__ #include <linux/types.h> struct ioctl_gntdev_grant_ref { / The domain ID of the grant to be mapped. / __u32 domid; / The grant reference of the grant to be mapped. / __u32 ref; }; / * Inserts the grant references into the mapping table of an instance * of gntdev. N.B. This does not perform the mapping, which is deferred * until mmap() is called with @index as the offset. / #define IOCTL_GNTDEV_MAP_GRANT_REF \ _IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref)) struct ioctl_gntdev_map_grant_ref { / IN parameters / / The number of grants to be mapped. / __u32 count; __u32 pad; / OUT parameters / / The offset to be used on a subsequent call to mmap(). / __u64 index; / Variable IN parameter. / / Array of grant references, of size @count. / struct ioctl_gntdev_grant_ref refs[1]; }; / * Removes the grant references from the mapping table of an instance of * of gntdev. N.B. munmap() must be called on the relevant virtual address(es) * before this ioctl is called, or an error will result. / #define IOCTL_GNTDEV_UNMAP_GRANT_REF \ _IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref)) struct ioctl_gntdev_unmap_grant_ref { / IN parameters / / The offset was returned by the corresponding map operation. / __u64 index; / The number of pages to be unmapped. / __u32 count; __u32 pad; }; / * Returns the offset in the driver's address space that corresponds * to @vaddr. This can be used to perform a munmap(), followed by an * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by * the caller. The number of pages that were allocated at the same time as * @vaddr is returned in @count. * * N.B. Where more than one page has been mapped into a contiguous range, the * supplied @vaddr must correspond to the start of the range; otherwise * an error will result. It is only possible to munmap() the entire * contiguously-allocated range at once, and not any subrange thereof. / #define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \ _IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr)) struct ioctl_gntdev_get_offset_for_vaddr { / IN parameters / / The virtual address of the first mapped page in a range. / __u64 vaddr; / OUT parameters / / The offset that was used in the initial mmap() operation. / __u64 offset; / The number of pages mapped in the VM area that begins at @vaddr. / __u32 count; __u32 pad; }; / * Sets the maximum number of grants that may mapped at once by this gntdev * instance. * * N.B. This must be called before any other ioctl is performed on the device. / #define IOCTL_GNTDEV_SET_MAX_GRANTS \ _IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants)) struct ioctl_gntdev_set_max_grants { / IN parameter / / The maximum number of grants that may be mapped at once. / __u32 count; }; / * Sets up an unmap notification within the page, so that the other side can do * cleanup if this side crashes. Required to implement cross-domain robust * mutexes or close notification on communication channels. * * Each mapped page only supports one notification; multiple calls referring to * the same page overwrite the previous notification. You must clear the * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it * to occur. / #define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \ _IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify)) struct ioctl_gntdev_unmap_notify { / IN parameters / / Offset in the file descriptor for a byte within the page (same as * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to * be cleared. Otherwise, it can be any byte in the page whose * notification we are adjusting. / __u64 index; / Action(s) to take on unmap / __u32 action; / Event channel to notify / __u32 event_channel_port; }; struct gntdev_grant_copy_segment { union { void virt; struct { grant_ref_t ref; __u16 offset; domid_t domid; } foreign; } source, dest; __u16 len; __u16 flags; /* GNTCOPY_* / __s16 status; / GNTST_* / }; / * Copy between grant references and local buffers. * * The copy is split into @count @segments, each of which can copy * to/from one grant reference. * * Each segment is similar to struct gnttab_copy in the hypervisor ABI * except the local buffer is specified using a virtual address * (instead of a GFN and offset). * * The local buffer may cross a Xen page boundary -- the driver will * split segments into multiple ops if required. * * Returns 0 if all segments have been processed and @status in each * segment is valid. Note that one or more segments may have failed * (status != GNTST_okay). * * If the driver had to split a segment into two or more ops, @status * includes the status of the first failed op for that segment (or * GNTST_okay if all ops were successful). * * If -1 is returned, the status of all segments is undefined. * * EINVAL: A segment has local buffers for both source and * destination. * EINVAL: A segment crosses the boundary of a foreign page. * EFAULT: A segment's local buffer is not accessible. / #define IOCTL_GNTDEV_GRANT_COPY \ _IOC(_IOC_NONE, 'G', 8, sizeof(struct ioctl_gntdev_grant_copy)) struct ioctl_gntdev_grant_copy { unsigned int count; struct gntdev_grant_copy_segment segments; }; /* Clear (set to zero) the byte specified by index / #define UNMAP_NOTIFY_CLEAR_BYTE 0x1 / Send an interrupt on the indicated event channel / #define UNMAP_NOTIFY_SEND_EVENT 0x2 #endif / __LINUX_PUBLIC_GNTDEV_H__ */ Back

Edit File : gntdev.h | Size : 7.15 KB

/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */
/******************************************************************************
 * gntdev.h
 * 
 * Interface to /dev/xen/gntdev.
 * 
 * Copyright (c) 2007, D G Murray
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef __LINUX_PUBLIC_GNTDEV_H__
#define __LINUX_PUBLIC_GNTDEV_H__

#include <linux/types.h>

struct ioctl_gntdev_grant_ref {
	/* The domain ID of the grant to be mapped. */
	__u32 domid;
	/* The grant reference of the grant to be mapped. */
	__u32 ref;
};

/*
 * Inserts the grant references into the mapping table of an instance
 * of gntdev. N.B. This does not perform the mapping, which is deferred
 * until mmap() is called with @index as the offset.
 */
#define IOCTL_GNTDEV_MAP_GRANT_REF \
_IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
struct ioctl_gntdev_map_grant_ref {
	/* IN parameters */
	/* The number of grants to be mapped. */
	__u32 count;
	__u32 pad;
	/* OUT parameters */
	/* The offset to be used on a subsequent call to mmap(). */
	__u64 index;
	/* Variable IN parameter. */
	/* Array of grant references, of size @count. */
	struct ioctl_gntdev_grant_ref refs[1];
};

/*
 * Removes the grant references from the mapping table of an instance of
 * of gntdev. N.B. munmap() must be called on the relevant virtual address(es)
 * before this ioctl is called, or an error will result.
 */
#define IOCTL_GNTDEV_UNMAP_GRANT_REF \
_IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
struct ioctl_gntdev_unmap_grant_ref {
	/* IN parameters */
	/* The offset was returned by the corresponding map operation. */
	__u64 index;
	/* The number of pages to be unmapped. */
	__u32 count;
	__u32 pad;
};

/*
 * Returns the offset in the driver's address space that corresponds
 * to @vaddr. This can be used to perform a munmap(), followed by an
 * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by
 * the caller. The number of pages that were allocated at the same time as
 * @vaddr is returned in @count.
 *
 * N.B. Where more than one page has been mapped into a contiguous range, the
 *      supplied @vaddr must correspond to the start of the range; otherwise
 *      an error will result. It is only possible to munmap() the entire
 *      contiguously-allocated range at once, and not any subrange thereof.
 */
#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \
_IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
struct ioctl_gntdev_get_offset_for_vaddr {
	/* IN parameters */
	/* The virtual address of the first mapped page in a range. */
	__u64 vaddr;
	/* OUT parameters */
	/* The offset that was used in the initial mmap() operation. */
	__u64 offset;
	/* The number of pages mapped in the VM area that begins at @vaddr. */
	__u32 count;
	__u32 pad;
};

/*
 * Sets the maximum number of grants that may mapped at once by this gntdev
 * instance.
 *
 * N.B. This must be called before any other ioctl is performed on the device.
 */
#define IOCTL_GNTDEV_SET_MAX_GRANTS \
_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
struct ioctl_gntdev_set_max_grants {
	/* IN parameter */
	/* The maximum number of grants that may be mapped at once. */
	__u32 count;
};

/*
 * Sets up an unmap notification within the page, so that the other side can do
 * cleanup if this side crashes. Required to implement cross-domain robust
 * mutexes or close notification on communication channels.
 *
 * Each mapped page only supports one notification; multiple calls referring to
 * the same page overwrite the previous notification. You must clear the
 * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
 * to occur.
 */
#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \
_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
struct ioctl_gntdev_unmap_notify {
	/* IN parameters */
	/* Offset in the file descriptor for a byte within the page (same as
	 * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
	 * be cleared. Otherwise, it can be any byte in the page whose
	 * notification we are adjusting.
	 */
	__u64 index;
	/* Action(s) to take on unmap */
	__u32 action;
	/* Event channel to notify */
	__u32 event_channel_port;
};

struct gntdev_grant_copy_segment {
	union {
		void *virt;
		struct {
			grant_ref_t ref;
			__u16 offset;
			domid_t domid;
		} foreign;
	} source, dest;
	__u16 len;

__u16 flags;  /* GNTCOPY_* */
	__s16 status; /* GNTST_* */
};

/*
 * Copy between grant references and local buffers.
 *
 * The copy is split into @count @segments, each of which can copy
 * to/from one grant reference.
 *
 * Each segment is similar to struct gnttab_copy in the hypervisor ABI
 * except the local buffer is specified using a virtual address
 * (instead of a GFN and offset).
 *
 * The local buffer may cross a Xen page boundary -- the driver will
 * split segments into multiple ops if required.
 *
 * Returns 0 if all segments have been processed and @status in each
 * segment is valid.  Note that one or more segments may have failed
 * (status != GNTST_okay).
 *
 * If the driver had to split a segment into two or more ops, @status
 * includes the status of the first failed op for that segment (or
 * GNTST_okay if all ops were successful).
 *
 * If -1 is returned, the status of all segments is undefined.
 *
 * EINVAL: A segment has local buffers for both source and
 *         destination.
 * EINVAL: A segment crosses the boundary of a foreign page.
 * EFAULT: A segment's local buffer is not accessible.
 */
#define IOCTL_GNTDEV_GRANT_COPY \
	_IOC(_IOC_NONE, 'G', 8, sizeof(struct ioctl_gntdev_grant_copy))
struct ioctl_gntdev_grant_copy {
	unsigned int count;
	struct gntdev_grant_copy_segment *segments;
};

/* Clear (set to zero) the byte specified by index */
#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
/* Send an interrupt on the indicated event channel */
#define UNMAP_NOTIFY_SEND_EVENT 0x2

#endif /* __LINUX_PUBLIC_GNTDEV_H__ */

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